DILATION

n. broadening, widening; expansion

The term dilation may have a number of meanings: In physiology, where it is synonymous with dilatation, it may mean:Pupil dilation (mydriasis)Dilation of blood vessels (vasodilation)Cervical dilation (or dilation of the cervix) in childbirthDilation and curettage (surgical dilation)Dilation following vaginoplasty
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Dilation /di·la·tion/ 1. the act of dilating or stretching. 2. dilatation. di·la·tion n. 1. The act of expanding or the condition of being expanded. [more]Dilation - Community and Resources

Noun
1. a lengthy discussion (spoken or written) on a particular topic
(hypernym) discussion, treatment, discourse
(derivation) elaborate, lucubrate, expatiate, exposit, enlarge, flesh out, expand, expound, dilate
2. the act of expanding an aperture; "the dilation of the pupil of the eye"
(synonym) dilatation
(hypernym) expansion, enlargement
(hyponym) vasodilation
(derivation) dilate, distend

(n.)
The act of dilating, or the state of being dilated; expansion; dilatation.
  

(n.)
Delay.